Here I describe the restoration of another legendary receiver from the second world war (WWII), the Telefunken E52 Köln, which
was mainly used by the German Luftwaffe for ground stations and vehicles.
The receiver was far ahead of competing designs of that time both in construction and performance. The chassis was moulded in an
aluminum alloy which gave good stability and heat dissipation, and the receiver was built in modules, interconncted with a back plane,
the valves were interchangable from the outside. Sensitivity, selectivity, resolution and stability were outstanding with 2 RF and 3 IF
stages, with continuosly variable bandwith crystal filters, with a projected photo scale and carefully temperature compensated circuits.
I will describe the initial condition, the restoration and the result in text and photos.